/* ****************************************************************************
application.h
-------------------------------------------------------------------------------

Copyright (c) 2017, Tain L.
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

**************************************************************************** */

#ifndef SPEARS_SPEARS_DEVICE
#define SPEARS_SPEARS_DEVICE

#include "../my-prerequisites.h"
#include "../core/hrtime.h"
#include "../../mathinc/mathinc.h"

namespace Spears
{
	class SPEARS_API Application
	{
	public:
		Application();
		virtual ~Application();

	public:
		Math::decimal get_frames_interval() const;
		void set_frames_interval(Math::decimal interval);

	public:
		void run();
		void pause();
		void resume();
		void stop();

	protected:
		/**
		@interface: before_frame
		@desc: called before render a frame. you should get things ready in this procedure.
		@retval: false if failed, and in_frame() & after_frame() will be skipped.
		*/		
		virtual bool before_frame() = 0;

		/**
		@interface: in_frame
		@desc: called if before_frame() succeeded. render the things in this procedure.
		*/
		virtual void in_frame() = 0;

		/**
		@interface: after_frame
		@desc: called after in_frame(). clean the temp things in this procedure.
		*/
		virtual void after_frame() = 0;

	protected:
		void frame_thread();

	protected:
		std::unique_ptr<std::thread>	m_p_thrd_frame;
		std::unique_ptr<std::mutex>		m_p_frame_mtx;
		std::unique_ptr<std::condition_variable> m_p_cv_framectrl;

		Math::decimal		m_frames_interval;
		bool				m_run;
	};
}

#endif // ! SPEARS_SPEARS_DEVICE